More like chain link fences, or "smart" fences, which is just a bunch of infrared cameras. Sometimes its not even that, just a little portion of paved roads to allow easier access. Also, there are large areas that are designated to be national parks or wildlife refuges, and where those exist there are no fences and troops are not allowed to go in that area. A double set of walls that go high and deep, made of concrete would do much better. Maybe we could make it into a raised highway. That might do better. And the "many security forces" are just a couple hundred troops stationed there, but only having a couple hundred on a border that stretches for a couple thousand... EDIT: As long as there are weak points in the border, we haven't done enough.